Asphalt Patching in Fargo, ND

Asphalt patching swaps a failed section of pavement, anything from a single pothole to a soft, cracked area, for new material, and around Fargo it is mostly spring work, because the thaw is when the base is weakest and holes open fastest. Every pothole begins as an opening that lets water reach the base. Freezing expands that water, thawing leaves a void and a soft layer, and wheels break the surface down into it. At Hector the pavement crosses the freezing line about 31 times in March and April combined. Good driveway repair here means cutting back to firm material, dealing with whatever let the water in, and patching with hot mix once the ground has drained. The cost page has the price ranges.

The thaw sets the timing. NDDOT restricts heavy loads on state highways each spring because, in its words, the most significant pavement damage happens in the first four weeks after the thaw begins. A driveway goes through the same weakness on a smaller scale. The top of the ground thaws first, meltwater collects above the still-frozen layer, and the base under the asphalt loses support. A heavy vehicle parked on a soft area in early April, whether a loaded pickup, a delivery van or a dumpster being dropped off, can push it down into a rut or a hole.

Cold patch is a stopgap. It comes in bags, can be shoveled into a hole in almost any weather and tamped down, and it keeps a pothole from growing until the season allows proper work. It is not meant to be a permanent repair. The permanent version is a saw-cut patch: the damaged area is cut into a clean rectangle that reaches past the edge of the failure, the broken pieces and the soaked gravel come out, fresh base goes in and is compacted in lifts, and hot mix is laid and rolled level with the old surface. At HomeGuide's rates a cold or hot patch costs $2 to $5 a square foot, and a saw-cut repair $4 to $12.

The soil under a patch decides how long it lasts. The Fargo soil series is a clay that drains very slowly and can carry a seasonal water table near the surface, and the Hegne series, mapped widely across the Red River Valley, holds its water table 6 to 18 inches down from April through June. A patch set back onto wet clay without fresh, compacted base tends to settle again. When a pothole returns to the same spot, the lasting repair often includes a deeper base, a geotextile fabric beneath it, or a way for water to leave, such as regrading a low edge or moving a downspout.

Fargo's own street crews list pothole repair, crack sealing, joint sealing and spray injection among their asphalt repairs. Spray injection blows emulsion and aggregate into a cleaned hole and suits quick fixes on busy streets. On a private drive the choice is usually between hand patching a small hole and saw-cutting anything larger or anything that sits in a wheel path. Utility trenches across a drive, from a water or sewer service repair, deserve the same saw-cut treatment, because backfill that went into wet clay keeps settling for a while. Where patches are followed by a coat, see driveway sealcoating.